單項(xiàng)選擇題The meat box temperature control circuit, as used in ship service refrigeration system, is an example of ()

A.two position control
B.signal speed floating control
C.proportional control
D.reset control


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1.單項(xiàng)選擇題The two most common gases used in pneumatic system are ()

A.compressed air and nitrogen
B.helium and nitrogen
C.oxygen and hydrogen
D.oxygen and acetylene

2.單項(xiàng)選擇題Restrictions occurring in the small orifices of pneumatic control system components can be used by ()

A.moisture in the compressed air supply
B.excessive dryness in the compressed air supply
C.pressure surging in the compressed air receiver
D.insufficient lubrication of the system components

4.單項(xiàng)選擇題In an automation system, the effect of a control action sensed by a controller is known as ()

A.command input
B.set point signal
C.output
D.feedback